单项选择题

What steps could be taken to improve the air

A．Reduce the amount of nitrogen.
B．Increase the release of oxygen.
C．Reduce nitrous oxide emissions.
D．Stop industrial activities.
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The temperature at Ann Arbor Airport was ________degrees Fahrenheit.
A．79
B．75
C．74
D．73
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Where did they plan to meet
A．Outside the Town Hall.
B．Near the bank.
C．In Steve’’s place.
D．At the cinema.
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